Last-turning lathe.



PATENTED APR. 28; 1903,:

J. T.'BROWN.

LAST TURNING LATHE.

PPL'IoA imN FILED JULY 5, 1901. 1

4 SHEETS-SHEETL N0 MODEL.

\A/ITNESSE m: "ohms PETERS co., PhoTaumQ, WASHINGIDH, a. c.

PATENTED APR.'28,j190$ J. T. BROWN. LAST TURNING LATHE.

APPLICATION FILE-D JULY 5, 1901.

4 SHEETS-SHEET 2;

I10 MODEL.

lNVENTEIRI Mm 7PM Np. 726,253. PATENTED APR.28,1903.

' J..T.BROWN.

- LAST TURNING LATHE.

APPLIOATIONIILED ULY 5, 1901.

4 SHEETS-SHEET 3..

no 116mm,.

- Elm-726.253. V PATENTED APR. 28, 1903.

J. T. BROWN. I LAST TURNING LATHE. 'APPLICIATION FILED JULY'E, 1901.

a 1 m x. W v ///wf/////////w/ 4 SHEETS-SHEET 4 J INVENTEIR 110 MODEL.

\X/ITNESEESI UNITED STATES- PAT'ENT ()FFICE JONATHAN T. BROWN, OF MARISLEHEAD, MASSACHUSETTS, ASSIGNOR' TO OLIVER A. MILLER, OF BROCKTON, MASSACHUSETTS.

LAST-TU RNING LATH E.

sPitoIFIoATIofi forming part of Letters Patent No. 726,253, dated April as, 1903.-

Application filed July 5, 1901- Serial No. 67,124. (No model.)

To all whom it may concern.-

Be it known that I, JONATHAN T. BROWN, of Marblehead, in the countyof Essex and State of Massachusetts, have invented certain new and useful Improvements in Last-Turning Lathes, of which the following is a specification.

This invention relates to improvements in machines for turning irregular forms, such as lasts, &c.

Reference is to be had to the accompanying drawings, forming a part of this application, in which like characters indicate like parts wherever they occur.

Figure l is a front elevation of a portion of a lathe constructed in accordance with my invention, showing the parts in their ultimate position with the last and the model in place. Fig. 21s a top plan viewof the same. Fig. 3 is a front elevation of the machine, showing the model and work in dotted lines in the position they occupy at the beginning of the turning operation, the model appearing at the left and the fore part block at the right. This figure also illustrates a modification in the construction of the link, as hereinafter described. Fig. 4 is a side elevation of the controller. Fig. 5 is a vertical sectional view thereof on the line 5 5 of Fig. 1. Fig. 6 is a cross-sectional view on the line 6 6 of Fig. 4

1 represents a portion of the framework of a machine of this class.

2 represents the swinging frame, the upper support of which is not shown, as it may be of the ordinary well-known construction. In this frame are mounted a model-chuck 3 and a model-spindle 4,adapted to support a model 5, here shown as a fore part, although it might be a heel part. At the right of this frame is shown the block 6', supported by a blockchuck 7 and a block-spindle'8. The chucks 3 and 7 are driven in unison by means of a shaft 9 and gearing 1O 11. I

12 represents a pattern-wheel.

13 represents acutter.

14 represents a model-wheel carriage.

15 represents the cutter-carriage.

In Fig. 2 the pattern-wheel is shown in position upon its carriage and the cutter shown as mounted upon a shaft 16, carried by'the cutter-carriage 15.-

17 represents a driving-drum carried by a shaft 17, mounted in the lower part of the framework.

18 represents a belt running from the driving-drum to apulley 20 on the shaft 16, Whereby the latter and the cutter 13 are driven 19 represents the tracks .on which the model-wheel frame 14 travels. I

l9 represents tracks on which the cuttercarriage 15 travels.

The parts thus far described may be of any preferred construction, and some of their details are not shown, since they form no part of my invention.

In machines of this class it has been customary to connect the model-carriage and the cutter-carriage by a controller which was organized as an adjustable connection, so that the cutter-carriage could be made to travel faster or slower than the model-carriage in order to make a larger or smaller form than the model employed, as will be readily understood by those skilled in the art. These machines have been employed for the turning of" a whole last that is to say, a last comprising a heel part and a'fore part. In some cases these lasts after being thus turned as a whole last have been cut'up in order to form hinge-lasts. When it was attempted to employ these machines for the turning of separable fore parts or heel parts instead of the whole last, it was found impracticable to properly control the movements of the'model and cutter carriages with relation to each other, by reason of imperfections inherent in one form of controller employed, especially when turning the fore parts.

Referring to Fig. 3, 28 represents a bar pivoted to the framework at its upper end by a bolt 21. The lower' end of this bar carries a bolt 22 in a slot 23 of a bracket 24, carried by one of the uprights of the framework. This permits the adjustment of the bar 28 about the point 21. 25 represents a sleeve arranged to slide on the bar 28. This'sleeve carries a ,pin 26, (see Fig. 4,) formed with a shoulder 27 and a screw-threaded extension 26 27 represents a lock-nut arranged on the nut 27 and the shoulder 27.

sents a lever formed with a handle 31, by which it may be manipulated, and with a slot 32 atits lower end arranged upon the extension 26 between the nut 27 and the shoulder 27. 33 represents a tapered spindle arranged in a complemental recess in the front side of the carriage 14 and loosely held in place by a pin 34, passing through an aperture 35 in the inner end of the spindle 33. This spindle is formed with a shoulder 36, arranged to engage the carriage 14. From the shoulder 36 projects ascrew-threaded extension 37, arranged in a complemental screwthreaded recess 38 in the lever 30. (See Figs. 5 and 6.) By this arrangement the lever 30 is pivotally supported upon and carried by the model-wheel carriage 14 and moves with the latter in a manner controlled by the position of the screwthreaded extension 26 in the slot 32, as in the form of controller heretofore used. represents a plate resting at its ends upon lugs 51, that in turn rest upon the front side of the lever 30. 52 represents screws passing through the plate 50 and lugs 51 and into the lever 30, thus securing the plate 50 to the lever 30, but a slight distance away from the latter. 53 represents a curved slot formed in the plate 50. This slot, as shown, constitutes a short are whose center is toward or beyond the cutter-carriage end of the machine. The degree of curvature of this slot should be as small as possible and permit the necessary adjustments. represents an extension-bar on the outer end of the cutter-carriage 15, as shown in Figs. 1 and 2. 62 represents a pin carried by the outer end of the bar 60, and 63 represents a link pivoted to the outer end of the pin 62. 64 (see Figs. 1 and 2) represents a bar formed with a sleeve 65, in which is arranged the free end of the link 63. A lock-nut 66, carried by the sleeve 65 and ar ranged to impinge upon the link 63, serves to lock the bar 64 and link 63 together in any desired position to adjust them. The front end of the bar 64 is enlarged, as at 67, and arranged between the plate 50 and the lever 30. (See Figs. 4 to 6.) The enlargement or boss 67 is forined with a recess 68. The upper front side of the lever 30 is formed with two flanges 70, leaving a groove 71. In the recess 68 is arranged a pin 74, which is held against outward movement by the head 73. The pin 74 extends through and is adapted to slide in the slot 53. The outer end 75 of the pin 74 is screw-threaded to receive a nut or hand-wheel 76. Such space as may intervene between the plate 50 and nut 76 may be taken up by washers, such as those at 77 and 78. By this arrangement the boss 67 and the washer 78 may be made to grip the plate 50 and maintain the boss in any desired position of adjustment along the arc-groove 53. 80 represents a scale marked along the groove 53. 31 represents a pointer carried by the bar 64 to indicate upon the scale or graduation 80 the particular adjustment of the boss 67. In effeet, the link 63 and bar 64 constitute an eX- tensible link, while the link 63 in Fig. 3 is shown as composed of one piece. The link 63 is made as long as practicable, much longer than in the old type of machine, in order that its horizontal position may be varied as little as possible, due to movements of its free end up and down the slot 53, so that this link when pushing or pulling the cutter-carriage may as far as practicable remain in the horizontal line, and thus prevent any changing of adjustment. In forming the groove or are 53 the lever 30 is placed in a vertical position opposite the pattern-wheel 12 when at the extreme limit of its motion to the left. (See Figs. 1 and 2.) In such position and with the pin 62 as a center an arc is marked out on the plate 50. This is afterward cut, forming the groove 53. In such position all the parts are timed together, and the movement of the link 63 up and down to change the relative speed of the cutter-carriage does not move either the lever 30 or the cutter-carriage, since the link 63 swings on its center 62 and the pin 74 runs in the slot 53 as the are of a circle. When first adjusting the machine to this kind of work, the sleeve 65 and set-screw 66 are serviceable in case the link 63 is not exactly the right length; but after the parts are once positioned and mounted at the position shown in Figs. 1 and 2 the said screw 66 does not require further attention, and the variations in the length of the fore part and heel part may be made readily by moving the link 63 up and down, the operator being enabled with precision to determine the proper adjustment to make, by reason of the graduations 80 and the pointer 81.

Various modifications will suggest themselves to those skilled in the art without departing from the spirit and scope of my invention; but I believe myself to be the first to connect a cutter-carriage to the modelwheel carriage by means of a connection that admits of adjustment without varying the position of the carriages during the adjusting operation, and I desire to claim the same in the broadest legal manner.

Having thus explained the nature of my invention and described a way of constructing and using the same, though without at tempting to set forth all the forms in which it may be made or all the modes of its use, what I claim, and desire to secure by Letters Patent, is-

1. In a machine of the class described, a model-wheel carriage,a cutter-carriage, a con troller-lever connected to the model-wheel carriage, and means connecting said lever with the cutter-carriage so arranged as to permit the adjustment thereof without varying the length of the link or disturbing the position of the carriages.

2. In a machine of the class described, a model-wheel carriage, a cutter-carriage, a controller-lever connected to'the model-wheel carriage and formed with an arc shaped slot,

a link pivoted to the cutter-carriageformed riages, and an arc-and-radius connecticn 'bewith a member arranged in said slot, said tween said lever and the other carriage. 10 slot and link constituting when the parts are In testimony whereof I have aflixed my sigin their initial position, respectively the arc nature in presence of 'two Witnesses.

5 and radius of a circle. JONATHAN T; BROWN.

3. In a, machine of the class described, a Witnesses: m0de1-whee1carriage,a cutter-carriage, a con- E. BATOHELDER,

' troller-iever connected to one of said car-' P. W. PEZZETTI. I 

